As someone who has worked at both the biggest corps and the smallest startups (and in between), I can see how going from OpenAI to Meta could hit you like a truck after you do onboarding.
Don't like it? Great, I don't either. Do something about at will employment.
The reality is that at will employment is abused 1 million to 1 by companies versus laborers. We truly, genuinely, do not give a single fuck when companies screw people over.
We shouldn't, then, care when people do it back. That sucks, sure, so change the laws.
Either way if a company is willing to throw money to hire you, you probably have enough leverage to get them to write a custom contract in your favor.
Amazon avoids this problem altogether by paying the signing bonus 1/52 with each bi-weekly paycheck for the first two years. They also do the proration on five workdays in a week when it's in their favor, but seven days in a week when it's in your favor, so they win either way.
These guys already have Fuck-you-money https://en.wikipedia.org/wiki/Fuck-you-money
Noun,
"fuck you money" (uncountable)
(US, slang, vulgar) Enough money to leave
one's job, etc. and enjoy the lifestyle
of one's choice.I mean, if it was me, and I had a bit of a buffer (which, y'know, you'd assume most people in this position do), there'd be a temptation to say "screw that, life's too short", and take a few months off before looking for a job somewhere less silly.
I don't get it. You voluntarily choose to leave a very highly paid job in favor of an extremely high paid job, and then you... just don't show up to work? What could possibly go so wrong between the time of signing the job contract and showing up to work on day 1?